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A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

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Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..

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Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..

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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..

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Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..